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<p><a href="../../editdocs#docs/tasks/access-application-cluster/service-access-application-cluster.md" id="editPageButton">Edit This Page</a></p>

<h1>Use a Service to Access an Application in a Cluster</h1>



<p>This page shows how to create a Kubernetes Service object that external
clients can use to access an application running in a cluster. The Service
provides load balancing for an application that has two running instances.</p>












<ul id="markdown-toc">










<li><a href="service-access-application-cluster.1#objectives">Objectives</a></li>












<li><a href="service-access-application-cluster.1#before-you-begin">Before you begin</a></li>












<li><a href="service-access-application-cluster.1#creating-a-service-for-an-application-running-in-two-pods">Creating a service for an application running in two pods</a></li>




<li><a href="service-access-application-cluster.1#using-a-service-configuration-file">Using a service configuration file</a></li>




















<li><a href="service-access-application-cluster.1#cleaning-up">Cleaning up</a></li>












<li><a href="service-access-application-cluster.1#what-s-next">What's next</a></li>



</ul>



<h2 id="objectives">Objectives</h2>
<ul>
<li>Run two instances of a Hello World application.</li>
<li>Create a Service object that exposes a node port.</li>
<li>Use the Service object to access the running application.</li>
</ul>





<h2 id="before-you-begin">Before you begin</h2>
<p>You need to have a Kubernetes cluster, and the kubectl command-line tool must
be configured to communicate with your cluster. If you do not already have a
cluster, you can create one by using
<a href="../../getting-started-guides/minikube">Minikube</a>,
or you can use one of these Kubernetes playgrounds:</p>

<ul>
<li><a href="https://www.katacoda.com/courses/kubernetes/playground" target="_blank">Katacoda</a></li>
<li><a href="http://labs.play-with-k8s.com/" target="_blank">Play with Kubernetes</a></li>
</ul>
 

<p>To check the version, enter <code>kubectl version</code>.</p>




<h2 id="creating-a-service-for-an-application-running-in-two-pods">Creating a service for an application running in two pods</h2>

<ol>
<li><p>Run a Hello World application in your cluster:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl run hello-world --replicas<span style="color:#666">=</span><span style="color:#666">2</span> --labels<span style="color:#666">=</span><span style="color:#b44">&#34;run=load-balancer-example&#34;</span> --image<span style="color:#666">=</span>gcr.io/google-samples/node-hello:1.0  --port<span style="color:#666">=</span><span style="color:#666">8080</span></code></pre></div>
<p>The preceding command creates a
<a href="../../concepts/workloads/controllers/deployment/index.html">Deployment</a>
object and an associated
<a href="../../concepts/workloads/controllers/replicaset/index.html">ReplicaSet</a>
object. The ReplicaSet has two
<a href="../../user-guide/pods/index.html">Pods</a>,
each of which runs the Hello World application.</p></li>

<li><p>Display information about the Deployment:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl get deployments hello-world
kubectl describe deployments hello-world</code></pre></div></li>

<li><p>Display information about your ReplicaSet objects:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl get replicasets
kubectl describe replicasets</code></pre></div></li>

<li><p>Create a Service object that exposes the deployment:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl expose deployment hello-world --type<span style="color:#666">=</span>NodePort --name<span style="color:#666">=</span>example-service</code></pre></div></li>

<li><p>Display information about the Service:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl describe services example-service</code></pre></div>
<p>The output is similar to this:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">Name:                   example-service
Namespace:              default
Labels:                 <span style="color:#b8860b">run</span><span style="color:#666">=</span>load-balancer-example
Annotations:            &lt;none&gt;
Selector:               <span style="color:#b8860b">run</span><span style="color:#666">=</span>load-balancer-example
Type:                   NodePort
IP:                     <span style="color:#666">10</span>.32.0.16
Port:                   &lt;unset&gt; <span style="color:#666">8080</span>/TCP
TargetPort:             <span style="color:#666">8080</span>/TCP
NodePort:               &lt;unset&gt; <span style="color:#666">31496</span>/TCP
Endpoints:              <span style="color:#666">10</span>.200.1.4:8080,10.200.2.5:8080
Session Affinity:       None
Events:                 &lt;none&gt;</code></pre></div>
<p>Make a note of the NodePort value for the service. For example,
in the preceding output, the NodePort value is 31496.</p></li>

<li><p>List the pods that are running the Hello World application:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kubectl get pods --selector<span style="color:#666">=</span><span style="color:#b44">&#34;run=load-balancer-example&#34;</span> --output<span style="color:#666">=</span>wide</code></pre></div>
<p>The output is similar to this:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">NAME                           READY   STATUS    ...  IP           NODE
hello-world-2895499144-bsbk5   <span style="color:#666">1</span>/1     Running   ...  <span style="color:#666">10</span>.200.1.4   worker1
hello-world-2895499144-m1pwt   <span style="color:#666">1</span>/1     Running   ...  <span style="color:#666">10</span>.200.2.5   worker2</code></pre></div></li>

<li><p>Get the public IP address of one of your nodes that is running
a Hello World pod. How you get this address depends on how you set
up your cluster. For example, if you are using Minikube, you can
see the node address by running <code>kubectl cluster-info</code>. If you are
using Google Compute Engine instances, you can use the
<code>gcloud compute instances list</code> command to see the public addresses of your
nodes.</p></li>

<li><p>On your chosen node, create a firewall rule that allows TCP traffic
on your node port. For example, if your Service has a NodePort value of
31568, create a firewall rule that allows TCP traffic on port 31568. Different
cloud providers offer different ways of configuring firewall rules.</p></li>

<li><p>Use the node address and node port to access the Hello World application:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">curl http://&lt;public-node-ip&gt;:&lt;node-port&gt;</code></pre></div>
<p>where <code>&lt;public-node-ip&gt;</code> is the public IP address of your node,
and <code>&lt;node-port&gt;</code> is the NodePort value for your service. The
response to a successful request is a hello message:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">Hello Kubernetes!</code></pre></div></li>
</ol>

<h2 id="using-a-service-configuration-file">Using a service configuration file</h2>

<p>As an alternative to using <code>kubectl expose</code>, you can use a
<a href="../../user-guide/services">service configuration file</a>
to create a Service.</p>


















<h2 id="cleaning-up">Cleaning up</h2>
<p>To delete the Service, enter this command:</p>

<pre><code>kubectl delete services example-service
</code></pre>

<p>To delete the Deployment, the ReplicaSet, and the Pods that are running
the Hello World application, enter this command:</p>

<pre><code>kubectl delete deployment hello-world
</code></pre>





<h2 id="what-s-next">What&#39;s next</h2>
<p>Learn more about
<a href="../../concepts/services-networking/connect-applications-service.1">connecting applications with services</a>.</p>







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